<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 100px;
            height: 100px;
            background: red;
            border-radius: 0px 0px  100px 00px;
            transition: all 3s;
            
        }
        div:hover{
            box-shadow: 5px 5px 10px ;
        }
    </style>
</head>

<body>
    <div>

    </div>
</body>

</html>